<template>
  <scroll
    class="suggest"
    :data="result"
    :pullup="pullup"
    :beforeScroll="beforeScroll"
    @scrollToEnd="searchMore"
    @beforeScroll="listScroll"
    ref="suggest"
  >
    <ul class="suggest-list">
      <li
        class="suggest-item"
        v-for="(item, index) in result"
        :key="index"
        @click="selectItem(item)"
      >
        <div class="icon">
          <i :class="getIconCls(item)"></i>
        </div>
        <div class="name">
          <p
            class="text"
            v-html="getDisplayName(item)"
          ></p>
        </div>
      </li>
      <loading
        v-show="hasMore"
        title=""
      ></loading>
    </ul>
    <div
      v-show="!hasMore && !result.length"
      class="no-result-wrapper"
    >
      <no-result title="抱歉，暂无搜索结果"></no-result>
    </div>
  </scroll>
</template>

<script type='text/ecmascript-6'>
import { search } from 'api/search'
import { ERR_OK } from 'api/config'
import { createSong, isValidMusic, processSongsUrl } from 'common/js/song'
import Scroll from 'base/scroll/scroll'
import Loading from 'base/loading/loading'
import Singer from 'common/js/singer'
import { mapMutations, mapActions } from 'vuex'
import NoResult from 'base/no-result/no-result'

const TYPE_SINGER = 'singer'
// perpage每一页返回的歌曲数量
const perpage = 20

export default {
  props: {
    query: {
      type: String,
      default: ''
    },
    showSinger: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      page: 1,
      result: [],
      pullup: true,
      beforeScroll: true,
      hasMore: true
    }
  },
  methods: {
    search() {
      // 初始化搜索时,页数重置为1,可搜索更多设置为true,scroll复位到0，0
      this.page = 1
      this.hasMore = true
      this.$refs.suggest.scrollTo(0, 0)
      search(this.query, this.page, this.showSinger, perpage).then((res) => {
        if (res.code === ERR_OK) {
          this._genResult(res.data).then((result) => {
            this.result = result
            this._checkMore(res.data)
          })
        }
      })
    },
    searchMore() {
      if (!this.hasMore) {
        return
      }
      this.page++
      search(this.query, this.page, this.showSinger, perpage).then((res) => {
        if (res.code === ERR_OK) {
          this._genResult(res.data).then((result) => {
            this.result = this.result.concat(result)
            this._checkMore(res.data)
          })
        }
      })
    },
    getIconCls(item) {
      if (item.type === TYPE_SINGER) {
        return 'icon-mine'
      } else {
        return 'icon-music'
      }
    },
    getDisplayName(item) {
      if (item.type === TYPE_SINGER) {
        return item.singername
      } else {
        return `${item.name}-${item.singer}`
      }
    },
    selectItem(item) {
      if (item.type === TYPE_SINGER) {
        let singer = new Singer({
          id: item.singermid,
          name: item.singername
        })
        this.$router.push({
          path: `/search/${singer.id}`
        })
        this.setSinger(singer)
        this.haveSinger = true
      } else {
        this.insertSong(item)
      }
      this.$emit('select')
    },
    refresh() {
      this.$refs.suggest.refresh()
    },
    listScroll() {
      this.$emit('listScroll')
    },
    _checkMore(data) {
      const song = data.song
      if (!song.list.length || (song.curnum + song.curpage * perpage) >= song.totalnum) {
        // 如果所有的歌曲都加载完毕，就把hasMore设置为false
        this.hasMore = false
      }
    },
    _genResult(data) {
      let ret = []
      if (data.zhida && data.zhida.singerid && this.page === 1) {
        ret.push({ ...data.zhida, ...{ type: TYPE_SINGER } })
      }
      return processSongsUrl(this._normalizeSongs(data.song.list)).then((songs) => {
        ret = ret.concat(songs)
        return ret
      })
    },
    _normalizeSongs(list) {
      let ret = []
      list.forEach((item) => {
        let musicData = item
        if (isValidMusic(musicData)) {
          ret.push(createSong(musicData))
        }
      })
      return ret
    },
    ...mapMutations({
      setSinger: 'SET_SINGER'
    }),
    ...mapActions([
      'insertSong'
    ])
  },
  watch: {
    query() {
      this.search()
    }
  },
  components: {
    Scroll,
    Loading,
    NoResult
  }
}
</script>

<style scoped lang='stylus' rel='stylesheet/stylus'>
@import '~common/stylus/variable'
@import '~common/stylus/mixin'

.suggest
  height: 100%
  overflow: hidden
  .suggest-list
    padding: 0 30px
    .suggest-item
      display: flex
      align-items: center
      padding-bottom: 20px
    .icon
      flex: 0 0 30px
      width: 30px
      [class^='icon-']
        font-size: 14px
        color: $color-text-d
    .name
      flex: 1
      font-size: $font-size-medium
      color: $color-text-d
      overflow: hidden
      .text
        no-wrap()
  .no-result-wrapper
    position: absolute
    width: 100%
    top: 50%
    transform: translateY(-50%)
</style>
